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SBD ELECTRICAL SEQUENCE OF OPERATION
Module (PV) Terminal
Sends 24V to Pilot Coil
Spark Stops
Technical Training Department
Ashland City, TN ©2003
SBD TANK TYPE HEATERS
SERVICE HANDBOOK
115/60/12A
120 VAC to Junction Box
On / OFF Switch "ON"
24V Transformer
Tank Temperature
Calling for Heat
High Limit Closed
Thermostat Closed
Motor Opens
Damper
Cam On Damper Blade
Closes Proving End Switch
IID Module
(24V) Receives Voltage
Module (Spark) Sends
10,000V Spark to Pilot
Pilot Ignites and Proves Flame
Module (MV)
Terminal Sends 24V
5 Minute Delay Between
To Main Gas Coil
Main Burner Heats Tank
Themostat Opens
Power to Damper
#2 Interrupted
Damper Motor Energized
and Damper Closed
18
Tank Temperature
Satisfied
High Limit (ECO)
Closed
Motor Closes
Damper
90 Second Trial /
Trials - Continuously
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